Auto merge of #246 - mbrubeck:warnings, r=jdm

Silence warnings about deprecated LayoutErr

This is renamed to LayoutError in Rust 1.51 and later, but we need to continue using the old name to support older versions of Rust.

src/lib.rs

@@ -86,6 +86,7 @@ extern crate std;
 #[cfg(test)]
 mod tests;
 
+#[allow(deprecated)]
 use alloc::alloc::{Layout, LayoutErr};
 use alloc::boxed::Box;
 use alloc::{vec, vec::Vec};
@@ -238,6 +239,7 @@ impl fmt::Display for CollectionAllocErr {
     }
 }
 
+#[allow(deprecated)]
 impl From<LayoutErr> for CollectionAllocErr {
     fn from(_: LayoutErr) -> Self {
         CollectionAllocErr::CapacityOverflow